MAPKAPK5, a novel mitogen-activated protein kinase (MAPK)-activated protein kinase, is a substrate of the extracellular-regulated kinase (ERK) and p38 kinase.
A novel protein kinase that has significant sequence homology to mitogen-activated protein kinase (MAPK)-activated protein kinase (MAPKAPK) was identified. This novel protein kinase has a nucleotide sequence that encodes a protein of 473 amino acids and shares 45%, 46%, and 44% amino acid sequence identities to MAPKAPK2, 3 and 4 respectively. Northern blot analysis revealed that it has a wide tissue distribution. This novel protein kinase designated MAPKAPK5 can be phosphorylated by extracellular-regulated kinase (ERK), and p38 kinase but not by c-jun N-terminal kinase (JNK) in vitro. Recombinant GST-MAPKAPK5 protein can phosphorylate a peptide derived from the regulatory light chain of myosin II. Phosphorylation of MAPKAPK5 by ERK and p38 kinase increased its activity by 9 and 15 fold respectively. Taken together, these data suggest that MAPKAPK5 is a novel in vitro substrate for ERK and p38 kinase.
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Department of Chemistry, University of North Carolina, Chapel Hill 27599, USA.
Wang
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Diener
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Yao
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D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism*; D003001:Cloning, Molecular; D004789:Enzyme Activation; D047908:Intracellular Signaling Peptides and Proteins; D048031:JNK Mitogen-Activated Protein Kinases; D051379:Mice; D020928:Mitogen-Activated Protein Kinases; D008969:Molecular Sequence Data; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000737:chemistry* / Q000378:metabolism; D012333:RNA, Messenger / Q000032:analysis; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013379:Substrate Specificity; D048051:p38 Mitogen-Activated Protein Kinases
D047908:Intracellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; C111049:MAP-kinase-activated kinase 5; D017346:Protein Serine-Threonine Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D048031:JNK Mitogen-Activated Protein Kinases; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases